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You don't want to be anywhere near Seattle at any of the daily rush hours.
For my money the 405 is the way to go , but both routes are subject to big delays at any moment. Traffic is that heavy.
The interchange from I-5 to the 405 coming from the south, is a bit of a bear , watch the signs carefully , you go right to get of the I-5 , maneuver to avoid the exit to Sea Tac , one of these days I'll take the Kent exit and join the 405 from there.

North bound go through late morning(after 11:30) on I5 so you can get the express lanes just north of I90. As you near the express lanes you will need to move to the far left lane. South bound 10:00 to get the express lanes. As you get near the express lanes you will need to move to the far left lane. Been going up and back more than I want too for family. I5 will be faster than 405 most of the time. Google maps will give you times. Either route will get you through, but I5 is the easiest in heavy traffic with a big rig. Watch the big rigs most are going through.

There are major repairs and re-surfacing work going on on I-5 northbound between downtown Seattle and the Ship Canal bridge. It's reduced to two working lanes resulting in back-ups of 6 miles or more. I-405 is a bit of a zoo because the locals are using it instead of I-5.

We moved away from the area some years ago and live in Anacortes, so I'm getting the info from Seattle area TV news. It sure doesn't look like fun. Unfortunately, there are no viable alternatives except surface streets.

I don't think a MH or anything towing something can use the express lanes. Seems to me there are signs stating that but it's been almost two years since I needed to take the late DW to the U of W for cancer stuff.

I don't think a MH or anything towing something can use the express lanes. Seems to me there are signs stating that but it's been almost two years since I needed to take the late DW to the U of W for cancer stuff.

Been using the express lanes for years while towing. I started doing it when I saw semis using it and I was sitting in trafic

I don't think a MH or anything towing something can use the express lanes. Seems to me there are signs stating that but it's been almost two years since I needed to take the late DW to the U of W for cancer stuff.

Yes, in certain locations there are signs that limit weight to 10 tons.

I don't believe there is the 10,000 lb GVW anywhere on the I-5 Express Lanes.

There is a 10,000 lb. GVW restriction on the I-405 Express Toll Lanes but recreational vehicles are exempt ...see attached from WSDOT.

The OP didn't mention the time of day so using I-5 as opposed to I-405 would depend on time of day or if it's on a Saturday or Sunday but I'd probably agree with the consensus that I-5 is the better choice ...especially if the Express Lanes are open in the proper direction.

My apologies for the misinformation, I was recalling signage I had seen in on an interstate in the Seattle area, and your right it would have been 10,000lb. I was also unaware it excluded RVís.
Thanks for the correction.

I don't believe there is the 10,000 lb GVW anywhere on the I-5 Express Lanes.

There is a 10,000 lb. GVW restriction on the I-405 Express Toll Lanes but recreational vehicles are exempt ...see attached from WSDOT.

The OP didn't mention the time of day so using I-5 as opposed to I-405 would depend on time of day or if it's on a Saturday or Sunday but I'd probably agree with the consensus that I-5 is the better choice ...especially if the Express Lanes are open in the proper direction.

The documet you posted is dated 2016, so it's fairly new and I haven't been in or through Seattle since my late DW got on the OHSU transplant list in April 2016.
There was a letter of understanding between the WA DOT and the WA State Patrol that they wold allow over 10,000# RV's to use the third lane for passing but that was some years ago too. I retired from the WA DOT in 1998 and I used to keep up on some of those rules but no longer.